Typewriting machine



Sept. 27, 1932.. w HELMOND 1,879,231

TYPEWRITING MACHINE Filed Sept. '22, 1930 6V 6 Aflorney WILLIAM .nnnmonn, or wnsr innncrronn, connnc'rrcn'r, nssronon TO 11mm,

woon ELLIOTT msnnn COMPANY, OF'NEW Yonx,

Patented Sept. 27, 1932 UNITEDSTATES PATENT OFFICE WARE N. Y., A CORPORATION or DELA-,

TYREWRITING nAcnnin 2 Application filed September 22, 1980. Serial No. 483,518.

' This inventionrelates to line-locking mecib anism for typewriting machines.

' According to the present improvements,

the types are prevented 'fromprinting,'when the carriage hasreached the end of the typing.

line, by novel means which look the escape mentuniversal bar, to arrest the type-bars.

There is a reduction of n'oiseof the'locking mechanism. According to the present invention a cross-bar revolves slightly and noiselessly upon its pivot, when being moved to lock or release the type-bars. The crossbar does not have to be aligned or adjusted in any way whatsoever, and all fine adjust ments throughout the entire locking mechanism have been eliminated, thereby reducing the cost of manufacture, and also permitting any repair work orinstallation of the present invention to be easily made by any mechanic.

The traveling typewriter-carriage, 'While being fed. near the end of its typing line, depresses a marginal rack-bar, and swings a downwardly-extending arm forward to operatea bell-ringing hammer.

There is reduction of the resistance offered to the carriage when operating the locking mechanism. This-reduction is accomplished by eliminatingthe swinging movement of the cross-bar, and by so supporting the cross-bar that little pressure need be expended to op crate the same. 1 V

The carriage depresses a margin-stop-rack, to rock a cross-bar that is supported on the side frames of the machine; A rearwardlyextending memberis mounted, at one end, -on said cross-bar and is slidahly' supported at its other end in a slot provided in a bracket mounted on the 'carria-g'e-eseapement frame. This member has a bent-over locking piece normally in ineflective position, but moves to effective position when the typewriter-carriagenears the end of its line. I

The carriageoperates to draw the rearwardly-extending member forward tohol'd the bent-over portion in the path of an oscillating arm which forms part of an escapement-mechanism, thereby preventing the escapement arm from oscillating, and so pre venting, operation of the universal bar to which the arm is fixed. This prevents the Y types from printing, and also prevents the operation of the usual space-bar; In; this mannen-a positive lock is provided for' -all speeds of operation of themac'hine.

This locking is assured because the uni-V versal bar is not operated until the type-key is at least half-way depressed and the typebar is about an inch from-the platen, so that ample time is given to the locking member to get into the path or said oscillating arm of the escap-ement-mechanism. f v :Other'teatures and advantages will here inafter' appear. r I Inthe aocornpany drawing, Y v v Figu're liis a :perspective View [of part of a typewritingmachine, vention applied thereto.

-.Figure 2 :is a fragmentary side view :of the rear portion of the key-xlocking mechanism shown-in igure 1, but shows thelocking bar in its effective position.

of Figure 1, showingthe key-lock release-key operated, and the key-locking mechanism moved to ineffeetiveposition.

"Figure 4 is a fragmentary sectional side elevation, showing parts of a typewriting machine together with my novel key locking' showing my. in-.

Figure 3 is aa fragmentary front elevation.

showing the, front'portion of the key-locking V mechanism inoperated position.

Type-keys 1-0 depress key-levers 11 to rock bell-cranks 12 to "swing type-bars 1 3 upwardly and :rearwardlyabout a fulcrum-rod 13, to cause their vtypes 14 to print {against a platen 1-5, mountedin-a carriage16. The carriage-escapement-mechanism 17 includes .a rack 18 hinged on carriage 16 engaging a pinion 19, which is eontrolled .by an escapement-wheel 20. The

latter rotates under the control} of a pair of feeding dogs 21, that are rocked at each operation of a type-key 10, "by means ofheel's 22 on the type-bars 13, said heels engaging a universal bar 23 'thatis mounted on and frame 24. The universal bar frame 243s slid-' ably supported at the front in aseg-ment 25,

d is mounted at its rear on upwardly ex 27, which in turn is connected to universal At each operation of 'a type-bar 13' the universal bar 23, through connections 24,

bar 23.

26 and 27, oscillates arm33. This provides for feeding th Underwood ribbon-feeding.

mechanism shown in the patent to F. A.

Young, 959,829, of May31, 1910; The arm 33 and the universal bar 23 are-returned by usual spring 34. 5 V c The carriage 16 runs upon a front rail 35 and rear rail 36, and is propelled by-springdrumand belt 37. v

When the carriage 16 approaches the end of a line, itengages the usual left-hand margin-stop 38, adjustably supportedon shaft 39,-and held by a rack-bar 40 swinging on shaft 39. Spring 41, coiled around the shaft,

holds rack 40 in upper normal position. Fromthe' rack-bar 40 extends downwardly'an arm f manner, the universal bar 23 w ll arrest the gages the usual compound cam 44, forming part of the margin-stop 38,- to swing the rackbar 40 downwardly and swing the arm 42 forwardly; A trip-member 45 engages a cam 46 formed on the forward end of a rearwardly-extending pivoted arm 47, to depress the same and cause a hammer 48 fastened to the rear end of the arm 47 to strike a usual bell 49. c

The normal position of the arm 42 andthe rack-bar 40 is determined by a lug 50 near the lower end of the arm 42 engaging the main typewriter-frame 29. The lug 50 is normally held against the frame 29 under the tension of spring 41.

"Upon further letter-feeding movement of the carriage 16, the tappet 43 rides along the compound cam 44, thereby depressing still further the rack-bar 40, which in turn swings the arm 42 further forward, to cause the novel key-locking mechanism of my present invention to become effective.

' This novel mechanismincludes a cross-bar 51 provided at its ends with downwardly-cit tending supporting ears52 for rotatably and slidablv mounting the cross-bar 51 on screwstuds 53 fixed in the sides of the machineframe 29. The cross-bar: 51 has near its mid dle portion an upwardly-extending finger 5 4, to which the forward end of a rearwardlyextending locking bar 55 is mounted The lockingbar 55 is provided at its rear end with a bent-over projection 56 that is guided and supported in an'L-shaped slot 57 formed in A tappet 43 fastenedon the carriage 16 en-' ward, sliding the projection 56 inits guiding slot, 57'into the path of an upward extension 62 on the front of the oscillatingarm 33 (Figure 2) Should a type-key 10 be operated now, its corresponding type-bar13, together with its types 14, will be swung upward towards the platen. Prior to the types 14 reaching the platen, the type-bar heel 22 will engage the universal bar, 23 and tend to force the latter rearwardly to operate the escapement-dogs 21 and oscillate the ribbon-feeding arm 33.

However, such rearward movement of the universal barwill be prevented, due to the projection 56 being in the path of oscillation of the extension 62 on the ribbon-feeding arm 33, so that the arm 33 is prevented from oscillating, which in turn prevents the universal bar from being moved rearwardly out ofthe path of the operated type-bar. In this swinging type-bar 13 before its types 14 reach the platen and thereby prevent printing from taking place. The arrestingof the swinging type-bar 13 prevents its operated type-keys 10 from being fully depressed, and immediately calling the attention of the operator to the fact that thetype-bar-locking mechanism has become effective. 4. Should the operator desire to type a few additional letters to finish an .uncompleted word, a key-lockreleasakey '63 maybe operated; The release-key 63 is mounted on a key-lever 64, which may be similar to the key-levers 11, and maybe mounted at its rear on the same shaft 65 and in the same manner as the otherkey-levers 11. The key-lever 64 may be guided at the front in its vertical movement by a 'usual key-lever-guiding comb-plate 66. y The release-key 63 is preferably positioned inthe keyboard at the extreme right of the top bank of type-keys 10. A bent-up arm 67 from the crossbar 51 is provided-at its top edge with a camming surface 68 that directly underlies the releasekeyslever 64. The camming surface 68 is so formed that when the key-lever 64 is depressed, the arm 67 together with the bar 51 and arm 61, may be moved sidewise to the right, on their supporting studs53, against the tension of a return spring 69, untilit-he arm' 61 clears the pin 60 (Figure v The spring 69 is preferably wound upon the right-hand stud 53 between the car 52 and the machine-frame 29, and has one end stood that the spring 69 is wound to form a combined compression and torsional spring.

As soon as the arm 61 clears the pin 60, the torsional force of the spring 69 swings the bar 51 together with the arm 61, finger 54 and bar 55 rearwardly until a limiting stop on the bar 51 abuts a projection 71 forming part of the machine-frame 29. The rearward movement of the bar 55 moves the projection 56 out of the path of the extension 62, and thereby permits the universal bar 23 to be operated again.

Upon release of the release-key 63, the compressed spring 69 will push the bar 51 leftwardly back to its normal position, wherein the arm 61 will be directly behind the pin 60. It will be understood that the bar 55 is provided with sufiicient play or clearance at its supports to permit the sidewise movement of the bar 51.

Upon operation of one or two additional type-keys 10, the carriage 16 and the tappet 43 will again move toward the left, and the arm 42 and pin 60 are swung rearwardly by the spring 41. The construction of the tripmember 45 permits the pin 60 to ride over the top of the arm 61 and snap down behind it. The entire locking mechanism is now in its normal position.

Upon operation of a few more type-keys 10, the carriage reaches its final stop position, and the tappet 43 will again coact with the compound cam 44 in a similar manner as above described, to again move the key-locking mechanism to its effective position.

The projection 56 and the bar 51 are limited in their forward movements by a stop 72 on the extension 62 protruding into the path of the projection 56. It will be seen that by this means the forward rotation of the crossbar 51 is limited, thereby preventing the spring 69 from becoming damaged, and also avoiding the projection 56 from slipping out of its supporting and guiding slot 57. 7

Variations may be resorted to within the scope of the invention, and portions of the lmprovements may be used without others.

Having thus described my invention, I claim:

1. In a typewriting machine having a carriage and a key-operated universal bar, the combination of a locking member for said universal bar, a slidably mounted cross-bar, means to enable the carriage to rock the crossbar and thereby move said locking member to efiective position, a key having means for sliding said cross-bar lengthwise, and thereby release the cross-bar from the carriage,

and a spring to restore the released cross-bar and the locking member to ineffective posi tions. 7

2. In a typewriting machine, the combination with a key-operated universal bar and a traveling carriage, of an arm rocked 5 by the carriage, a cross-bar rocked by said arm, .a ilocking slide moved' by rocking or said c ross-bjarlto position to efi'ect locking' of said universal bar, said cross bar mounted for endwise movement, a release key efiective to move said cross-bar endwise and thereby release it trom -saidcarriage,'and a spring to return said locking slide torts ineffective position.

3. In a typewriting machine, the combination with -a*trave*ling carriage and a key-.

operated universal bar, of arocking crossbar mounted to slide, a locking member connected to said cross-bar, means operated'by said carriage to rocksaid cross-bar and thereby move said member to position to lock said universal bar, a cam for sliding said cross-bar endwise, and means cooperating with said cam and cross-bar to restore said locking memberto its ineffective position.

5. In a typewriting machine, the combination with a traveling carriage and a keyoperated universal bar, of a rocking crossbar, a locking member connected to said crossbar, means operated by said carriage to rock said cross-bar and move said member to position to lock said universal bar, said crossbar mounted for endwise movement, and means for moving said cross-bar endwise and thereby efi'ect the restoration of said locking member to its ineffective position, said means including a cam on said cross-bar and a keylever overlying said cam, and .efiective upon depression "to move said cross-bar endwise through engagement with said cam.

6. In a typewriting machine, the combination with a traveling carriage and a keyoperated universal bar, of a rock-arm operated by the traveling carriage, a cross-bar mounted for rocking and endwise movements,

a locking member connected to said crossbar, means at one end of said cross-bar engaged by said rock-arm to rock said crossbar and move said member to position to lock said universal bar, and means at the other end of said cross-bar to move said cross-bar endwise to eflect' the restoration of said locking member to its inefl'ective-position.

7. In a typewriting machine, the combi-. nation with a traveling carriage, a key-operated universal bar, and an arm fixedto the universal bar to oscillate at each key-operation, of a rock-arm operated by the carriage, a rocking cross-bar rocked by said arm, a

locking member connected at one end to said cross-bar, and means at the other end of said locking member to guide the latter into lock ing engagement with said oscillating arm during the rocking of said cross-bar bysaid traveling carriage, a

8 In a typewriting machine, the combination with a traveling carriage, a key-operated universal bar, and an arm fixed to the universalbar to oscillate at each key-operation, of a rock-arm operated by the carriage, a; rocking cross-bar rocked by said arm, a locking member connected at one end to said cross-bar, a support at the other end of said locking member to guide the'latter into looking engagement with said oscillating arm during the rocking of said cross-bar by said traveling carriage, and means on said oscillating arm to limit the forward movement of said locking member. i

WVILLIAM EHELMOND. 

